Re: Looking for Lunar Lander schematics

Just a quick addendum. I removed the board to look at it, then reinserted
it and scoped each of the X axis input bits. Of course, each bit was moving
like it should. Then I checked the output of the game on the scope again,
and it was good. So, now I have an intermittent problem to find. This
problem first happened several months ago, and when I scoped it, I saw the
failure on the scope, then moments later, it looked great on the scope, and
then it looked great on the monitor, too! The problem has just come back
recently, so I fiigured I'd finally do something about it. I'll have to
leave the test equipment hooked up, that will guarantee that the problem
never comes back. :-)

Joel-

----- Original Message -----
From: Joel Rosenzweig <joel.rosenzweig@verizon.net>
To: <vectorlist@synthcom.com>
Sent: Wednesday, January 01, 2003 11:25 PM
Subject: VECTOR: Looking for Lunar Lander schematics

> I'm looking for a PDF of the Lunar Lander schematics. Spies doesn't have
> one, does anyone here have one available?
>
> I'm trying to troubleshoot a video problem in the board's X output stage.
> I've double checked with a scope, and found the problem to be on the game
> board. The X output in the left 1/3rd of the screen is behaving badly.
The
> vectors are squished on the left hand side and the right hand side of the
> left third of the screen where the fuel units are displayed. There is
> spotty coverage of stretched vectors connecting the squished vectors
within
> this region of the screen. My best guess at the moment is a stuck low
order
> input bit to the AD561.
>
> If anyone has a location to grab the schematics, or has an idea of what
the
> problem really is, send it along.
>
> Thanks and Happy New Year!
>
> Joel-
>
>
>
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Received on Wed Jan 1 20:44:25 2003